1 How to resolve diagnostic LED 3 not lit on A1058 iMac G5
I have moved the question here on the suggestion of the moderator:
I spent most of the day yesterday replacing the 25 1800 uF and 1000 uF capacitors on my mother's old A1058 iMac G5, trying to resurrect it. 6 of the capacitors had obviously bulging capacitors.
Before the replacement, LED 1 would light up, then LED 2 would briefly light and go out. Now LED 2 lights up solid, but LED 3 doesn't light up. I reset the SMU, still can't get LED 3 to light up. LED 3 is supposed to indicate that the screen and the CPU are in communication, if I recall.
I did manage to get a hold of an external display adapter and the iMac is perfectly happy connecting to it, that display works fine! In fact, I have confirmed the iMac G5 does now boot, it just can't seem to talk to the internal screen.
Any suggestions on what could be interfering in the communication between the iMac motherboard and the internal screen and how to test for it? I have been told the LCD displays DON'T generally fail. I imagine it could be the inverter, but don't know how I would test for that.
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I did reset the SMU, didn't fix it.
- de Juan Cabanela
I also re-seated all the inverter and video cable connections, didn't fix it.
- de Juan Cabanela
I checked with a flashlight and this is not a case where the display is not backlit, the display is not on, period. So this is unlikely to be the inverter.
- de Juan Cabanela
I am also in the same exact situation as you except I have another iMac g5 to test it on. It's definitely not the screen nor the inverter. I switched a working setup with the problem board and it still did not light up led #3. It's something on the board. I'm going to reflow the GPU but possibly might not fix it.
- de Erickson Palomares
Please start your own question as it will (did) get lost tagged onto another question
- de mayer